On Mon, 14 Jan 2013 09:40:56 +0100, Henri Sivonen <hsivonen@iki.fi> wrote:
> Would it be terrible to make attempts to mutate the 'is' attribute
> throw thereby teaching authors who actually try to mutate it that it's
> not mutable?
We already have several attributes that are immutable but don't throw or
anything when they're changed.
e.g. <script src>, <html manifest>.
In the case of manifest, we omitted the IDL attribute to signal that it
shouldn't be changed.
As another example, <input type> was immutable in old IE and that made
people think of it as immutable.
--
Simon Pieters
Opera Software